Move vr features.gni into its own directory.

device/vr/features/BUILD.gn

Index: device/vr/features/BUILD.gn
diff --git a/device/vr/features/BUILD.gn b/device/vr/features/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..e8afb4a3c2c1ff8e312c478d0f62416ca8abb5f8
--- /dev/null
+++ b/device/vr/features/BUILD.gn
@@ -0,0 +1,15 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("features.gni")
+import("//build/buildflag_header.gni")
+
+# Generate a buildflag header for compile-time checking of WebVR support.
+buildflag_header("features") {
+  header = "features.h"
+  flags = [
+    "ENABLE_VR=$enable_vr",
+    "ENABLE_OPENVR=$enable_openvr",
+  ]
+}